Machine for grinding file-blanks or the like.



' No. 733,439. PATENTED JULY 14, 1903.

J. TURNER.

MACHINE FOR GRINDING FILE BLANKS OR THE LIKE. APPLIOATION'IILED JAN. 10. 1903.

no MODEL.

UNrfrED STAT-Es Patented July 14, 1903.

PATENT OEEIQE.

JAMEs TURNER, OE PRO ID N E, RHODE ISLAND, ASSIGNOR TO NICHOL- soN FILE COMPANY, OF PROvInENoE, RHODE ISLAND, A CORPORATION O F RHODE ISLAND.

MACHINE FOR GRINDING FlLE-BLANKS OR THE LIKE;

SPECIFICATION forming part of Letters Patent No. 733,439, dated my 14, 1903.

Application filed January 10,1903. Serial No- 138.479. (No model.)

Be it known that I, JAMES TURNER, a citizen of the United States of America, residing at Providence, in the county of Providence and State of Rhode Island, have invented cer-' tain new and useful Improvements in Machines for Grinding File-Blanks or the Like, (for which I have made application for Letters Patent in Great Britain under No.13,609, dated the 16th of June, 1902,) of which the following is a specification.

This invention relates to machines for grinding file-blanks and the like, its object being to provide means for holding the blanks in position while the rounded faces of What are known as half-round and other curvedfaced files are being ground, these means being such that the blanks may be ground right up to and including their tips or file ends. The blank is supported upon a suitable bed arranged adjacent to a grindstone, and it is to the means for holding the blanks upon this bed that the present invention more particularly relates. Heretofore the tip end of the blank has been held upon the bed by a sleeve or collar, which surrounds the end of the blank and prevents that portion of the blank from being subjected to the action of the grinding wheel. In grinding blanks with curved faces either the blank or the grindstone is reciprocated, so as to move one longitndinally past the other, and the bed upon which the blank is supported is rocked intermittently, step by step, and so that the curved face of the blank is ground in longitudinal sections extending from one end of the blank to the other. WVhen the rocking bed is in po sition to present one edge of the curved face in the path of the grinding-wheel the other edge of the curved face is some distance away from the plane of the path of the grinding- Wheel. Availing myself of this fact, the present invention consists in providing means for holding the blank upon the bed which shall engage or overlie the curved face of the blank only at or near one edge thereof, thereby leaving the other edge of the blank exposed to the action of the grinding-wheel clear to and including the tip of the blank, such holding means being constructed so as to be wholly out of the path of the grindingwheel when the rocking bed is in position to present the other edge of the curved face in the path of the grinding-Wheel.

In the accompanying-drawings, Figure l is 7 an elevation of a frame carrying a group of the beds. Fig. 2 is a side view of Fig. 1. Fig. 3 is an elevation of a companion bed to those shown in Fig. 1, and Fig. 4 is a section on the line 4 4 of Fig. 3.

Like letters indicate like parts throughout the drawings.

A suitable frame A is provided, in which a number of beds B for holding the blanks to be ground are grouped. At or near one end of the frame A a series of conical pivotpoints A, each engaging a corresponding recess in the end of one of the beds B, is secured in a bar or projection A on the frame A. The other'end of each bed 13 is also rotatably mounted in a second bar or projection A at the other end of the frame A, as shown at A Other methods of mounting the beds B, however, may be employed so long as they are allowed to rotate or rock about their axes. Lugs B are formed on or secured to the beds B, these lugs being conveniently shaped, as shown, to provide projections B for the shoulders at the tang ends of the blanks to rest against the recesses B for the reception of the tangs themselves. Sockets B or the like may also be provided to further secure the tangs of the blanks to the beds,

and these sockets may either be fixed, as

shown, or movable longitudinally on the beds B. At or near the other end each bed is provided with a projection O at one side, having an inwardly-extending lip O or being made concave on the side adjacent to the bed. It will be understood that each bed carries a blank D, (indicated by dotted lines in Fig. 1,) which is temporarily secured thereto at one end by its tang resting in the recess 13 and engaged by the socket 13, its shoulders bearing against the projections B At the other end the file-blank D is held to its bed B by the projection C or its lip O.

The beds B are rocked about their axes by suitable means, a convenient method being to provide each with an arm E, all the arms Ice E being pivoted to a connecting-rod F, which is provided with a slotted arm F. By the rotation of a crank-pin or the like engaging this slottedv arm F the beds B will be rocked together about their respective axes.

In operation a blank to be ground is attached to one of the beds B and the frame A mounted adjacent to a rotating grindstone. It will be understood that by reciprocating either theframe or the grindstone and by intermittently rocking the bed B step by step the curved face of the blank may be ground in longitudinal sections extending from one end of the blank to the other. As the projection O or lip O engages or overlies the blank only at one edge and as when the bed B is in position to present the opposite edge of the blank to the action of the grinding- Wheel the lip G will be below or out of the path of the grinding-wheel. Said Wheel may pass over and act upon that portion of the blank clear up to and including the tip of the blank. The construction of the projection C- or lip O is such that the bed B may be rocked, so as to present at least one-half of the curved face of the blank-viz, all of that portion of the curved face lying to one side of a central line extending longitudinally of the blankto the action of the grinding-wheel without bringing the lip G into the path of said wheel, and consequently the whole of this half of the blank may be ground clear to the tip. By then transferring the blank to a companion bed in which the projection O is located at the opposite side of the bed, as shown in Fig. 3, and so as to engage the opposite edge of the blank the other half of the curved face of the blank may be likewise ground clear up to the tip. Thus the entire curved face of the blank, including the tip, may be ground.

As shown in Fig. 1, the beds 13 are all alike in the frame A, the blanks being ground thereon and then removed to another frame provided with companion beds, as described above, and this frame may either be substituted for the first or also fixed in the one machine or be arranged in a second. As a modification the beds in the frame A may comprise both varieties, the blanks on one set being, preferably, first ground and then those on the other, after which the blanks are trans posed and the operation repeated to complete the grinding.

It will be understood that the term projection applied to the part marked C and G on the drawings is intended to include a ridge or the like extending wholly or partially along one side of the bed, the face of the latter being suitably shaped. be divided into two or more independent parts.

One ormore pads G,ot'india-rubber or other soft material, are secured to the face of each of the beds B, so as to provide a yielding hearing for the blanks.

What I claim as my invention, and desire to secure by Letters Patent, is

1. In a grinding-machine, the combination of a bed, means for rocking said bed, and means for engaging the blank at one edge which will be out of the path of the grindingwheel when the bed is in position to present the other edge of a curved-face blank in the path of the grinding-wheel, substantially as described.

2. In a grinding-machine, the combination of a bed, means for rocking it, means for temporarily securing the tang end of a blank thereto, and a projection thereon for engaging the blank at one edge, substantially as described.

3. In a grinding-machine, the combination of two beds, means for rocking them, means for temporarily securing the tang end of a blank to each of said beds, and a projection on each bed for engaging the side of the blank,

the projection on one bed being arranged to engage the blank at one edge, and the projection on the other bed being arranged to en gage the blank at its opposite edge, substantially as described.

4:. In a grinding-machine, the combination of a bed, means for rockingit, means for temporarily securing the tang end of a blank thereto, and a projection on the side of the bed having an inwardly-extending lip, substantially as described.

JAMES TURNER.

Witnesses:

W. H. THURSTON, J. H. THURSTON.

Such a projection may 

